Bump cookie and astro

Bumps [cookie](https://github.com/jshttp/cookie) to 0.7.2 and updates ancestor dependency [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro). These dependencies need to be updated together.


Updates `cookie` from 0.6.0 to 0.7.2
- [Release notes](https://github.com/jshttp/cookie/releases)
- [Commits](jshttp/cookie@v0.6.0...v0.7.2)

Updates `astro` from 4.9.3 to 4.15.12
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/astro/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/astro@4.15.12/packages/astro)

---
updated-dependencies:
- dependency-name: cookie
  dependency-type: indirect
- dependency-name: astro
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

demo/package.json

@@ -10,6 +10,6 @@
   },
   "devDependencies": {
     "@astrojs/mdx": "^2.2.2",
-    "astro": "^4.5.12"
+    "astro": "^4.15.12"
   }
 }

docs/package.json

@@ -12,7 +12,7 @@
   },
   "dependencies": {
     "@astrojs/starlight": "^0.24.0",
-    "astro": "^4.9.3",
+    "astro": "^4.15.12",
     "astro-og-canvas": "^0.4.2",
     "sharp": "^0.32.5",
     "starlight-package-managers": "^0.4.0"